1. Laboratory of Histophysiology; Department of Bioresource Science; Graduate School of Agricultural Science, Kobe University; 1-1 Rokkodai-cho, Nada-ku Kobe Hyogo Japan
2. Laboratory of Molecular Morphology; Department of Bioresource Science; Graduate School of Agricultural Science, Kobe University; 1-1 Rokkodai-cho, Nada-ku Kobe Hyogo Japan
3. Department of Immunology; Institute of Basic Medical Sciences, Graduate School of Comprehensive Human Sciences, University of Tsukuba; 1-1-1 Tennodai Tsukuba Ibaraki Japan
4. Laboratory of Microbiology and Immunology; Department of Bioresource Science; Graduate School of Agricultural Science, Kobe University; 1-1 Rokkodai-cho, Nada-ku Kobe Hyogo Japan